2001 Oldsmobile Aurora transmition

APPLE1YEAR

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2001 OLDSMOBILE AURORA

2001 Oldsmobile Aurora 172698 miles

Occasionally when I drive my 2001 Aurora at about 30 mph it don't want to shift into gear. It also once while I was driving it was shifting fine and it down shifted and would shift back again. When I got back in it and drove it later it shifted fine. Could you give me an idea of what might possibly going on?